Rock-drill.



M. A. KNAPP.

ROCK DRILL.

APPLICATION mso 3.23, 1915.

Patented May 4, 1915.

7 0.13 i. /sn-lul lNVENTOR. 2'( M cheek valve G7 overlaid by a ring (38, and this b v a circular wire screen 6l). About tapped boss (Sli. screws ring holding in place loosely the exhaust choking ring 71, and its circular spring 72. On the ring 71 is pin l, and on the back head is pin 74, which two pins hold the ends of the springs 72. as shown more clearly in Fig. 8. About the top of pressureI cylinder 23 screws the gland 7:3. holding the packing 7G. The lower end of the cylinder is closed by pointed plug 77.

1n Fig. il, theI main air feed valve 32 is shown in elevation in a section of a portion ol the bach head 12, as having the two air passages 33 and 35; both communicating with the air inlet passage 30. The air passage 35 extends around nearly half the circumference of the valve, as shown in Fig. 2. Since the two open ends of passage 33 on either side of the valve are comparatively narrow, the main air feed to the operating val\ e can thus be shut ofi' without closing the feed of air to the pressure cylinder 23. The pressure piston can then be exhausted into exhaust port '18, by still further turning 0H the valve in the same direction, opposite to the movement of the hands of a watch.

ln Fig. 5 shown al double taper pin 79, fitting into a section of a portion of the back head. lt has an upper large tapered portion Ho.k and a lower tapered portion 81, fitting simultamrously in their tapered holes in the metal ol the back head. At the center of the pin is the pinion 45, shown as engaging in the notch of the tube 43. lin 79, and valve $52, and their handles 16 and 17, are held in place by the ordinary nuts and washers. used on such valves, but not shown here..

ln ["ig. (l, in the hollow bent end 83 of the handle har 2li, is a diaphragm 84, through which plays a pin 85, on which screws a head Fili over a spring 9,7, compressed against the dia'ihragm. (lo the other end ofthe pin 85, is riveted a hooded hall' cylindrical piece 8l), whirh, when pushed out, as shown in the drmvmg,y tai .'-1 freelyr with the pin, and acts as a no intr-fargli to guide a falling stream o!" watrr into the hollow handle bar. 'l'he circular iop ou of' the piece 86 makes a tight lit in the handle bar when allowed to close b v the ext( nsion of spring 87.

ln Fig. 7. the split. ring number 7, Fig. 1, is shown as hm ing two symmetrically opposite bewled edges lll and fllyadapted to close not too lightly, the openings of passages 5 and 3. Fig. i. when the ring is turned about the drill axis; ihus regulating the escape of the leakage air past, the hammer and forward into the front head. ln consequence, this ring 7. regulate` aim the flow of such air into the drill shank.

.ln Flo'. "i4, is ,'shov n a bottom or inside View oi' the r: il, ig. 2, as a section taken on line A. Vig. l

Melting from left to right.

I show also in dotted line the position of the outlet 53, and of the circular spring 72 at rest. As seen here, if the flaring Wing 93 of the ring 71 is moved out opposite the circle of outlet 53, the end of the spring 72 is caught by pin 73 of the rin'f, and since in 74 1s fixed to the hack head, this motion bends spring 72, which when freed, moves the wing 93 from in front of outlet 53.

ln the operation oi' my invention, the drill being extended by lthe passage of air through port 35, passage 36, tuhe 38 and plug 39 to the space between closing piece 4-0, and pointed plug 77; the in of the handle bar 20 is pushed in by the linger of the workman and water from a can or dipper is poured into hood 89, turned in position to catch such water stream. The water passes screen 69, and valve 67, to the interior of piston 22. Being held upright by the pressure piston with water against piece 40, the drill is started operating, and the exhaust air blows past the two check valves, 57 and 60, into the water tank. A moments pressure on the wing U3 of ring 71, ehokes the exhaust to such an extent, that this pressure in the tank is quite suilicient, or if the air is taken from other points, the )ressure may he suilieient, without choking the exhaust. The handle 17 is now turned, so 'that the pinion 45, moves the 'tube 43 into position as shown, so thatI hole 47 opensI into the bottom of the tanli'.. This position of tube 423 closes the. opening of the lower of the notches cut in tube 43 for the pinion 45. later now flows out of hole 17, tube 43, and tube 8 to the hollow of shank $3 of the drill bit. The holes 5 and 6 being largely closed hy the ring 7, the air leaking past the front of hammer f), blows out of the hollow drill rod with the water supplied as explained.

()n stopping the drill, the air in the tank may be allowed to exhaust by a downward movement of tube 43 by a turning of pinion 45, so that the lowest of the notches for the pinion teeth opens into the tank piston at the top, exhausting the air, and allowing more water to be poured into the tank. If the drill mounted on a column, so that the water flows forward in the tank in piston 22, then the tube 43 is moved backward to allow water to flow, and moved forward tf) exhaust the air pressure.

Except where so specified, I do not conline my claims to the particular construetion shown in these drawings. l

rl'he air supply to the interior of piston 2L may he from anyv convenientl source, and other than from the exhaust of -the drill, as for example, or it may be from a special exhaust port, or from some other point of supply of compressed air, or expanded and exhausting air in the drill. l show a means of supplying to the piston a low pressure air supply suitable to the conditions of the bit, a plurality of openings from said tank t@ said connection, and :i cut olf valve niiurziiive upon. mieli Ul' Said npeiiirigs C0 Cut olfs zii' piermii; tlm rimanga of :iiror vater tlirfiugh said opening lo said liolluw lni.

13. ln ii rock drilling appar-MUS having :i drilling engine and :i hollow ilz'ill bit; :i irziter tank lixeil to said drilling engine, conmention from said water tank to said hollow bil. two openings fram said tank into said Connection, a cui, all valve operative upon each of aid @innings und :i cnnnection betwein said two valves, whereby either om: is Closed when the other is opened.

14. ln :i rock drilling apparatus haring a. drilling engine5 :i drill bit :ini'l ii handle bar adapted to gire mi ubcillatory rotating motion to Suid ilrill liit; :i waiter tank iillixcd to said drilling engine adapted to feed water to allay the dust, of drilling, a waiter enlizifzc port governing the feci-il of Water to :said tank, Suid pori; being upmi said liiinlill@ liar and cnnncrztiwl l0 Quill mink by ii pas 521g@ iiliwiipgli :mid liiindlc liar.

ln a rmi-,k drilling iiirrlizinibiii of tlm storici* typm l Ting :i lniiiinior, a, drill bit, und :i pr ffiiparzilizs. axially in lim; willi will liimiinci' unil ilriill hit; :i Waiter tank iillixil to siiiil drilling nicnliiinism and iiirlfiswl in ,will pisxtgiwo nppzimms, und mmms ivlinreliy tine fuller nl: Suid trink 'is' lied to tiva fmmiril pim-l', of said drilling mechanism lor lic piiiirm nl! :ill-(lying: lli@ (lust of drilling,

lli. 1n i moll. clrilliiip; mechanism o tlm Empel* lypr. haring; n, prossiurf nppzirfili cnnfiising in :i pressure iiSliiii zittzirlml in llie drilling inucliiuiigiii und :i n'cssiire cylinder Sliding' uboiit suoli prcssure piston; :i

Water sink inclosed in Said pressure pistmi und un air passage 'from said drilling iiieiiliiinism t@ ille inclofid space of :liiil Cylinder, ci'insigtii'ig; all ii time pag saixl drilling mechanism 'tliiiflig lffnfftli of ppb-ure piston.

1.'. ln :i wirk di ling :ippaiwilns lizii'ii'ig a 45 drilling engin@ :i (lx-ill bit and in inclosod passage from Mild drilling; engine ailing Saiil drill liity lo wir iig ci 'iig end; a titer tank :ii'iixed io drilling ngi mil :i 062mm?,- ion from said Water tank lo mid irirzlifissiil 5G p3 ge.

3S. in :i finzi( drilling apparatus ha! drilling engine :incl a lili-lilou ilrili bil; :i im tank zillixed t@ siiiil drilling apparzilizi, and means Wlwreiiy the water from Said ank ifi is delivered into Llie lwllnv; olf :mid mill-ow bit.

19. 4In zi, muli drilling apparatus liarirgg :i drilling en fine unil :i lmlliirr drill bit; a 'war ter mink mixed lm said drilling ii'giiiiiriiiif-f 6&2 malins wlireliy tlm ii'Lr/r vfumi will trink i# delivered inn hollow if mili liir, s iii xiieuns cmisistng in parl mi' "i :air in said iinli and of :i mili@ rlvl' nii ii, stream of Water intr; siiiil lirillow Oli siiiil bit. i-f

2). in a reali drilling appui-ilus inning :i drilling engine, u drill bit nml, un ii'ifiliifard passage *fumi smid drilling.angina :ilnnfj said drill bilJ lo nem its uniting cnil a imiter tank alliicd ti: fmiil drilling :immuables amil niiiziii whereby Wziifr firming from ,siiiljl duliireil iniii will inclnaml n;

Signed in flue "gn-@mime 1 V lL G. lacir, Gimnvinrii S. DQHELIN 

